My husband and I are planning our first-ever trip to Alaska in early September. We had thought about flying from home (Orlando) to Seattle and taking a ferry to Anchorage. Then renting an RV in Anchorage and driving up to Denali then down to Homer. After returning the RV to Anchorage, we would try to get a ferry back to Seattle and then fly back home to Florida. Is this doable? Do the ferries run in September? Thanks for your advice/input.